Vacation scheduling · Guide
How to schedule vacation by seniority
Every year someone has to collect vacation requests from a whole department, put them in seniority order, keep enough people working each week, and explain to the person who missed their turn why August is gone. Here is how HR teams, managers and union schedulers run a seniority vacation bid that holds up.
This guide describes common scheduling practice in general terms. Your collective bargaining agreement, employer policy and past practice decide how vacation is bid where you work. Check your agreement and with HR or your union representative.
Why vacation bids go wrong
Seniority vacation picking is simple to describe: the most senior person picks first, then the next, down the list. In practice it goes wrong in familiar ways:
- The list is wrong or disputed. A tie nobody resolved, a transfer counted the wrong way, a new hire missing from the list.
- Coverage is checked after the fact. Approvals pile up until one week has too many people off, and someone senior gets denied after the bid.
- The bid stalls. One person on nights or on leave holds up everyone behind them.
- Requests arrive out of order. Paper forms, email and a shared spreadsheet all at once, and the scheduler sorts it out by hand.
- Nobody can show what happened. When a grievance or complaint comes, there is no record of who picked what and when.
Each of these has a fix that can be written down before the bid opens.
Build the seniority list
The list is the foundation, so publish it and give people time to challenge it before the bid opens, not after. How seniority is defined (company, department, classification or unit seniority) is set by your agreement or policy. The scheduler's job is to apply it consistently.
Ties need a written answer. Common tie-breakers are below; use the ones your agreement or policy names, in the order it names them.
| Tie-breaker | How it works | Watch out for |
|---|---|---|
| Classification or unit date | Whoever entered the job or unit first goes first. | Transfers and promotions need a clear rule. |
| Hire or application time | An earlier hire time, or earlier application, goes first. | Records must actually hold the time. |
| Employee number | A lower (or higher) number goes first. | Only fair if numbers were assigned in order. |
| Drawing | Tied employees draw for order. | Do it openly, or with a method anyone can check afterwards, and record the result. |
If the bid covers several shifts, units or job classes that do not cover for each other, run a separate list and bid for each one.
Build the vacation calendar
Before anyone picks, publish the calendar of what can be picked. Three things go on it:
- The unit of picking. Whole weeks, days, or both. Many bids take whole weeks in the early rounds and single days later.
- Blackout periods. Weeks when vacation is not allowed or is limited, such as peak season, inventory or a planned system change, if your agreement or policy permits them. Mark them before the bid, never during it.
- Coverage limits. How many people can be off in each week, per shift or unit. This is the number that turns a seniority list into a real schedule.
| Weeks | Day shift: people off | Night shift: people off |
|---|---|---|
| Most weeks | 3 | 2 |
| Summer weeks | 4 | 2 |
| Year-end inventory | 0 (blackout) | 0 (blackout) |
| Holiday weeks | 2 | 1 |
Once a week reaches its limit, it is full for that shift. Showing people which weeks are still open, at the moment they pick, prevents most denied requests.
Rounds and caps
A single pass down the list, with no limit, lets the most senior people take every prime week. Rounds provide one alternative:
- Round one: everyone, in seniority order, picks up to a set number of weeks (one or two is a common choice).
- Round two: back to the top of the list, and everyone picks from what is left, up to another cap.
- Later rounds: remaining weeks and single days, until everyone has placed their vacation or passed.
Some agreements specify consecutive weeks in the first round, or let people split a week into days only after the week rounds are done. Write the rule for each round into the bid announcement.
Run the bid one turn at a time
The fairest bid is the one where each person picks when it is their turn, from exactly what is left, and the next person cannot pick until they are done. A shared spreadsheet or open request form turns into first come, first served whatever the list says.
- Notify each person when their turn opens, with the weeks still available.
- Give each turn a deadline that works for people on every shift, such as a working day rather than an hour.
- Check coverage at the moment of the pick, not afterwards, so a pick that is accepted stays accepted.
- Confirm every pick in writing right away.
Late and absent bidders
People are on leave, on nights, or simply miss the message. Decide the rule before the bid, in line with your agreement or policy:
| Rule | How it works | Trade-off |
|---|---|---|
| Next person picks; late bidder picks on return | The bid keeps moving. When the late person responds, they pick from what is left. | Keeps their seniority in later rounds; costs them first choice this round. |
| Advance preference list | Anyone who expects to be away submits ranked choices; the scheduler picks the first one still open on their turn. | Needs a clear form and a rule for when every choice is gone. |
| Proxy | A named coworker or representative picks for the absent person. | Authorize it in writing in advance. |
| Placed at the end | A missed turn moves to the end of the round. | Harsh for someone on leave; check it is allowed. |
Changes after the bid
Schedules change: people cancel, transfer or start leave. Agree in advance what happens to a week someone gives back. Re-offering released weeks in seniority order is a common approach, and it avoids rewarding whoever reads email first. Trades between employees, if your workplace allows them, should be approved against the coverage limits and recorded.
New hires and transfers who arrive after the bid usually pick from what is left. Write that into the announcement, so it is not decided case by case.
Post the results and keep the record
- Post the final schedule for everyone in the bid.
- Keep the seniority list as published, including how ties were broken.
- Record every pick with the round, the time and who entered it.
- Record every missed turn, proxy pick, release and trade.
- Keep the bid announcement with the rules for each round.
When a question comes months later about why someone was denied a week, the record answers it.
Questions
How does a vacation bid by seniority work?
Employees choose their vacation in order of seniority, one at a time, from the weeks still open. One approach is to run it in rounds: everyone gets a turn to take a limited number of weeks, then the order starts again from the top for the next round. The exact rules come from your policy or collective bargaining agreement.
Why limit how many weeks someone can take in the first round?
Without a cap, the most senior people can take every summer and holiday week before anyone else picks. A cap per round (one or two weeks is a common choice) spreads the prime weeks further down the list while still rewarding seniority.
How are seniority ties broken?
Your agreement or policy should say. Common tie-breakers include an earlier date in the classification, an earlier application or hire time, or a drawing. Publish the full order, with ties resolved, before the bid opens.
What happens if someone misses their turn?
Follow your agreement or policy. Common options are that the next person picks and the late employee picks when they respond, from what is left, or that a written list of preferences submitted in advance is used. Decide it before the bid, not on the day.
Can people trade vacation weeks after the bid?
Many workplaces allow it with manager approval, as long as coverage limits still hold. Released weeks are often re-offered in seniority order rather than first come, first served. Check your agreement or policy.
Is this legal advice for a union workplace?
No. This is a general guide to running the scheduling process. Your collective bargaining agreement, past practice and employer policy govern how vacation is bid in your workplace. Check with your HR team or union representative.